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| 型号： | ZXSC400E6TA |
| 厂商： | Diodes Inc |
| 文件页数： | 6/16页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT SOT23-6 |
| 特色产品： | LED Driver Solutions |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光，闪灯/白光 |
| 类型 - 次要： | 高亮度 LED（HBLED），白色 LED |
| 频率： | 200kHz |
| 电源电压： | 1.8 V ~ 8 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 供应商设备封装： | SOT-23-6 |
| 包装： | 剪切带 (CT) |
| 工作温度： | -40°C ~ 85°C |
| 产品目录页面： | 1478 (CN2011-ZH PDF) |
| 其它名称： | ZXSC400E6TACT |
ZXSC400
Peak current definition
In general, the I PK value must be chosen to ensure that
the switching transistor, Q1, is in full saturation with
maximum output power conditions, assuming
worse-case input voltage and transistor gain under all
operating temperature extremes.
Once I PK is decided the value of R SENSE can be
determined by:
Programming LED current
Once the required output power is determined, the LED
current can be programmed by adding a single resistor
in the LED chain. The resistor value is determined by
the following:
R SENSE =
V SENSE
I PK
Sense Resistor
A low value sense resistor is required to set the peak
current. Power in this resistor is negligible due to the
low sense voltage threshold, V ISENSE . At the bottom of
the page there is a table of recommended sense
resistors.
Output power calculation
By making the above assumptions for inductance and
peak current the output power can be determined by:
Where V FB = 300mV
I LED =
V FB
R LED
where
P OUT = I AV x V IN x
(Watts)
RLED selection table
I AV =
I PK
2
×
(T ON + T DIS )
(T ON + T OFF )
I LED
40mA
R LED
7.5
and
30mA
10
and
T ON
=
I PK × L
V IN
20mA
15mA
10mA
15
20
30
T DIS =
I PK × L
(V LED ? V IN )
Shutdown Control
The ZXSC400 offers a shutdown mode that consumes
and
T OFF ? 1.7 s (internally set by ZXSC400)
and
= efficiency e.g. 100% = 1
Operating frequency can be derived by:
a standby current of less than 5 A. When the voltage at
the S TDN pin between 1V and 8V (and also open circuit),
the ZXSC400 is enabled and the driver is in normal
operation. When the voltage at the STDN pin is 0.7V or
lower, the ZXSC400 is disabled and the driver is in
shutdown mode. The SHDN input is a high impedance
current source of 1 A typ. The driving device can be an
open collector or an open drain or a logic output with a
“ High “ voltage of 5V max. The device shutdown
current depends of the supply voltage, see typical
characteristics graph
F =
1
T ON + T OFF
Manufacture
Cyntec
IRC
Series
RL1220
LR1206
R DC ( ) Range
0.022 - 10
0.010 - 1.0
Size
0805
1206
Tolerance
±5%
±5%
URL
www.cyntec.com
www.irctt.com
ISSUE 1 - JANUARY 2003
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ZXSC400E6TA-CUT TAPE | 制造商:DIODES 功能描述:ZXSC400 Series 50 mA 200 kHz Surface Mount LED Driver Boost Converter - SOT-23-6 |
| ZXSC400EV2 | 制造商:ZETEX 制造商全称:ZETEX 功能描述:circuit diagram and bill of materials |
| ZXSC410 | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:VOLTAGE MODE BOOST CONVERTER |
| ZXSC410E6 | 制造商:Diodes Incorporated 功能描述:IC LED DRIVER BOOST CONVERTER SMD |
| ZXSC410E6TA | 功能描述:开关变换器、稳压器与控制器 G.P. Boost W/Shtdwn RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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